外割刀在准备要割断的落鱼或油管上滑动。
The external cutter slips over the fish or tubing to be cut.
外割刀一般用来去除落鱼的最上面的可能被损坏的部分，以便使打捞筒或类似的打捞工具与未损坏的表面接合。
External cutters are generally used to remove the topmost, possibly damaged, portion of a fish to enable an overshot, or similar fishing tools, to engage on an undamaged surface.
集尘部件，所述集尘部件具有被设置成靠近所述切割刀片的所述外周边的开口，用于吸入和收集粉尘；
The dust collection member has an inlet provided in proximity to the outer periphery of the cutting blade for drawing and collecting dust.
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